Xxhash

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- Build wheels for Python 3.12

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- Upgrade xxHash to v0.8.2
- Drop support for Python 3.6

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This is the last version to support Python 3.6

- Build Python 3.11 wheels.
- Remove setup.py test_suites, call unittest directly

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- Type annotations.
- Enabled muslinux wheels building.

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- New set `algorithms_available` lists all implemented algorithms in `xxhash`
package.
- Upgrade xxHash to v0.8.1.
- Drop support for EOL Python versions, require python >= 3.6 from now on.
- Migrate to github actions and build arm64 wheels for macOS.
- Always release GIL.

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- Fix Travis CI OSX dpl python2.7 get-pip.py error